[ADF-1623] routing integration for Viewer (#2404)

* routed viewer (demo app)

* toolbar support

* app menu component for demo shell

* navigate back button

* fix unit tests

* improve viewer type detection and rendering

* download button

* automatic pdf rendition, spinners, ui tweaks

* border for pdf pages

* scroll top support

* docs update

* info drawer placeholder

demo-shell-ng2/app/components/webscript/webscript.component.ts

@@ -21,6 +21,7 @@ import { LogService } from 'ng2-alfresco-core';
 @Component({
     selector: 'alfresco-webscript-demo',
     template: `
+        <adf-app-menu></adf-app-menu>
         <label for="script-path"><b>Insert a scriptPath</b></label><br>
         <input id="script-path" type="text" size="48" [(ngModel)]="scriptPath"><br>
         <label for="context-root"><b>Insert a contextRoot</b></label><br>